The rise of Internet of Things (IoT) technologies has revolutionized the way critical infrastructures operate, leading to an era of unique connectivity and automation. However, this transformation introduces a concern about the security of these interconnected systems. Ensuring the robustness of IoT security in critical infrastructure is of supreme importance, as any breach could have far-reaching consequences, affecting not only the operational integrity of these vital systems, but also potentially putting public safety and national security at risk. By examining vulnerabilities present in IoT devices, assessing risks associated with communication protocols, and delving into the various aspects of authentication and authorization mechanisms, our aim is to equip stakeholders with a comprehensive understanding of multidimensional security challenges. As IoT technologies are increasingly integrated into critical infrastructures, it is essential to meet the security requirements associated with this evolution. This collective effort will enable the establishment of a foundation that ensures the ongoing resilience and reliability of these critical systems.